Cornices
- Alpine
- Treeline
- Below treeline
- Likelihood
- Unlikely - Possible
- Size
- 1.5–3
Cornices are large, looming, and may trigger large persistent slabs on slopes below.
Triggering large storm slabs will be most likely in wind affected terrain on Monday.
Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
Cornices are large, looming, and may trigger large persistent slabs on slopes below.
It may be possible to trigger persistent weak layers of crusts/facets or surface hoar in the top 200 cm of the snowpack where there is not a thick crust under the recent snow.
Forecast 15 to 25 cm of snow and strong southwest winds on Sunday may form storm slabs that will be most reactive in wind affected terrain.
On Saturday, a couple skier triggered size 1 wind slabs were reported on north and west aspects at treeline.
A few natural and skier triggered wet loose avalanches up to size 2 were reported on sunny aspects at treeline.
Observations in this region are very limited. If you head out into the backcountry, let us know what you're seeing by submitting a MIN report.
Cornices are large and looming. Avoid traveling underneath them.
Forecast 15 to 25 cm of snow and strong southwest winds on Sunday may form storm slabs that will be most reactive in wind affected terrain. Below the recent snow, is either a crust or wind-scoured hard snow surfaces.
There are multiple persistent weak layers consisting of crust/facets or surface hoar in the top 200 cm of the snowpack.
The lower snowpack is generally well settled and strong.
Sunday Night
Cloudy. 10 to 20 cm of snow. 50 km/h southwest ridgetop wind. Treeline temperature -7 °C.
Monday
Mostly cloudy. 0 to 5 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.
Tuesday
Mostly cloudy. 30 km/h southeast ridgetop wind. Treeline temperature -7 °C.
Wednesday
Mostly cloudy. 0 to 5 cm of snow. 40 km/h south ridgetop wind. Treeline temperature -7 °C.
More details can be found in the Mountain Weather Forecast.